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<ul>
  <li>咖啡</li>
  <li>茶
    <ul>
      <li>绿茶</li>
      <li>红茶
        <ul>
           <li>中国茶</li>
           <li>非洲茶</li>
        </ul>
      </li>
     </ul>
  </li>
  <li>酒
      <ul>
        <li>白酒</li>
        <li>红酒</li>
        <li>啤酒</li>
      </ul>
  </li>
</ul>
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